134 lines
4.2 KiB
C++
134 lines
4.2 KiB
C++
#include "master.hpp"
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namespace factor {
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callstack* factor_vm::allot_callstack(cell size) {
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callstack* stack = allot<callstack>(callstack_object_size(size));
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stack->length = tag_fixnum(size);
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return stack;
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}
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/* We ignore the two topmost frames, the 'callstack' primitive
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frame itself, and the frame calling the 'callstack' primitive,
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so that set-callstack doesn't get stuck in an infinite loop.
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This means that if 'callstack' is called in tail position, we
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will have popped a necessary frame... however this word is only
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called by continuation implementation, and user code shouldn't
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be calling it at all, so we leave it as it is for now. */
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void* factor_vm::second_from_top_stack_frame(context* ctx) {
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void* frame_top = ctx->callstack_top;
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for (cell i = 0; i < 2; ++i) {
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void* pred = frame_predecessor(frame_top);
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if (pred >= ctx->callstack_bottom)
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return frame_top;
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frame_top = pred;
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}
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return frame_top;
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}
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cell factor_vm::capture_callstack(context* ctx) {
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void* top = second_from_top_stack_frame(ctx);
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void* bottom = ctx->callstack_bottom;
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fixnum size = std::max((fixnum) 0, (fixnum) bottom - (fixnum) top);
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callstack* stack = allot_callstack(size);
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memcpy(stack->top(), top, size);
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return tag<callstack>(stack);
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}
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void factor_vm::primitive_callstack() { ctx->push(capture_callstack(ctx)); }
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void factor_vm::primitive_callstack_for() {
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context* other_ctx = (context*)pinned_alien_offset(ctx->peek());
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ctx->replace(capture_callstack(other_ctx));
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}
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void* factor_vm::frame_predecessor(void* frame_top) {
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void* addr = frame_return_address((void*)frame_top);
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FACTOR_ASSERT(addr != 0);
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code_block* owner = code->code_block_for_address((cell) addr);
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cell frame_size = owner->stack_frame_size_for_address((cell) addr);
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return (void*)((char*)frame_top + frame_size);
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}
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struct stack_frame_accumulator {
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factor_vm* parent;
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growable_array frames;
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explicit stack_frame_accumulator(factor_vm* parent_)
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: parent(parent_), frames(parent_) {}
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void operator()(void* frame_top, cell frame_size, code_block* owner,
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void* addr) {
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data_root<object> executing_quot(owner->owner_quot(), parent);
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data_root<object> executing(owner->owner, parent);
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data_root<object> scan(owner->scan(parent, addr), parent);
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frames.add(executing.value());
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frames.add(executing_quot.value());
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frames.add(scan.value());
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}
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};
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struct stack_frame_in_array {
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cell cells[3];
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};
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void factor_vm::primitive_callstack_to_array() {
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data_root<callstack> callstack(ctx->peek(), this);
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stack_frame_accumulator accum(this);
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iterate_callstack_object(callstack.untagged(), accum);
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/* The callstack iterator visits frames in reverse order (top to bottom) */
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std::reverse((stack_frame_in_array*)accum.frames.elements->data(),
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(stack_frame_in_array*)(accum.frames.elements->data() +
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accum.frames.count));
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accum.frames.trim();
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ctx->replace(accum.frames.elements.value());
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}
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/* Some primitives implementing a limited form of callstack mutation.
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Used by the single stepper. */
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void factor_vm::primitive_innermost_stack_frame_executing() {
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callstack* stack = untag_check<callstack>(ctx->peek());
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void* frame = stack->top();
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void* addr = frame_return_address(frame);
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ctx->replace(code->code_block_for_address((cell) addr)->owner_quot());
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}
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void factor_vm::primitive_innermost_stack_frame_scan() {
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callstack* stack = untag_check<callstack>(ctx->peek());
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void* frame = stack->top();
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void* addr = frame_return_address(frame);
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ctx->replace(code->code_block_for_address((cell) addr)->scan(this, addr));
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}
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void factor_vm::primitive_set_innermost_stack_frame_quot() {
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data_root<callstack> stack(ctx->pop(), this);
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data_root<quotation> quot(ctx->pop(), this);
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stack.untag_check(this);
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quot.untag_check(this);
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jit_compile_quot(quot.value(), true);
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void* inner = stack->top();
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void* addr = frame_return_address(inner);
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code_block* block = code->code_block_for_address((cell) addr);
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cell offset = block->offset(addr);
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set_frame_return_address(inner, (char*)quot->entry_point + offset);
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}
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void factor_vm::primitive_callstack_bounds() {
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ctx->push(allot_alien((void*)ctx->callstack_seg->start));
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ctx->push(allot_alien((void*)ctx->callstack_seg->end));
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}
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}
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